<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        const p1 = new Promise((resolve, reject) => {
            try {
                console.log('请求A数据。。。');
                setTimeout(() => {
                    console.log('请求A数据结束。。。');
                    resolve("A数据")
                }, 1500)

            } catch (e) {
                reject(e.message)
            }
        })
        const p2 = new Promise((resolve, reject) => {
            try {
                console.log('请求b数据。。。');
                setTimeout(() => {
                    console.log('请求b数据结束。。。');
                    resolve("B数据")
                }, 2500)

            } catch (e) {
                reject(e.message)
            }
        })
        const p3 = new Promise((resolve, reject) => {
            try {

                console.log('请求c数据。。。');
                throw new Error('C错误')
                setTimeout(() => {
                    console.log('请求c数据结束。。。');
                    resolve("C数据")
                }, 2000)

            } catch (e) {
                reject(e.message)
            }
        })
        /* 
     Promise.race方法:
       promise实例中改变状态最快的那一个,无论成功还是失败
       race的返回值就是最快的这个实例保持一致
   */
        const result = Promise.race([p1, p2, p3]);
        console.log("result", result);
    </script>
</body>

</html>